This is the current tombstone oring for the X7 Valves # TA10060 and the A5 Valves 02-V v2. This is a slightly larger oring than the one used in the original A5 and X7 valves 02-V which had a shorter valve body.

Works with A5's after sn 602597. These include an updated valve body 02-25 v2 (longer) that requires a larger oring.

Not sure which valve you have? The orginal valve is 02-V and it had a valve body 02-25 that measured 1 & 15/16" long. For that, you would need the 02-72 oring.

If you have the 02-V v2 or TA10060 valves then those have the longer 02-25 v2 valve body and require the larger TA01058 oring shown here.

If have installed a new valve body on your A5 or X7, or your gun is new since April 2013, then you would need the new style Valve Oring Large TA01058.